One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6,8,10,9,12,7,11)(13,14,17,22,18,20,16,21)(15,23,25,19,26,28,24,27)(1,2,3,4)(6,10)(7,8)(11,12)(13,15)(14,19)(16,25)(17,24)(18,26)(20,27)(21,28)(22,23)(6,10)(7,8)(11,12)(13,15)(14,19)(16,24)(17,25)(18,26)(20,27)(21,23)(22,28) involution — undirected(14,20)(19,27)(21,22)(23,28) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.